As you can see, Estariel decided to heed the Eldest celestial, and didn’t take Briar to the mort- ah dangit, Estariel!

Don’t worry, if you were thinking that the party is not in the desert, you weren’t mistaken!

I could go into the answer, but it isn’t a short answer, now is it? Suffice it to say the man here is old and wise and knows a lot about how to counsel someone in their grief. Belief in/understanding of any kind of afterlife is iffy here, however, so that isn’t part of the equation.